Brake



June 26, 1934. R. s. SANFORD 1,964,181

BRAKE Filed May 13. 1929 IN V EN TOR.

RY 3; SAN FORD lPatented June 26, 1934 PATENT- OFFICE BRAKE Roy S. Sanford, South Bend, Ind, assignor to Bendix Brake Company, South Bend, Ind, a

corporation oi Illinois Application May 113, 1929, Serial No. 362,588

lb Claim.

This invention relates to brakes, and is illustrated as embodied in an internal expanding brake for an automobile. An object or" the invention is to increase the eiiectiveness of the brake by permitting at least one of the shoes to adjust itself automatically under load into full contact with the drum, by linking the shoe to permit shifting of the heel of the shoe as well as the toe. I prefer to link the shoe to another shoe which is mounted m on a fixed anchor, and there is illustrated in the drawing a novel three-shoe brake in which the secondary shoe is linked as described to the anchored end or" the auxiliary shoe. Preferably means, such as a friction pivot, is provided for yieldingly resisting relative movement of the link and one of the shoes, so that the link and shoe normally turn as a unit.

The above and other objects and features of the invention, including various novel and desirable details of construction, will be apparent from the following description or one illustrative embodiment shown in the accompanying drawing, in which:

Figure l is a vertical section through the brake, in a plane just inside the head of the brake drum, and showing the brake shoes in side elevation;

Figure 2 is a partial section on the line 2-2 of Figure 1, showing the connection between the primary and secondary shoes;

Figure 3 is another section, at right angles to the first one, through this connection, on the line 3-3 of Figure l; and

Figure 4 is a section through the novel brake anchorage, on the line l4 of Figure l.

l he illustrated brake includes a rotatable drum ill, at the open side of which is a support such as a backing plate 12, and inside of which is arranged the friction means or" the brake. The friction means shown includes a primary shoe 14 connected by a floating pivot 16 to an anchored secondary shoe 18, together with an auxiliary shoe 20 anchored at its lower end on a fixed pivot 22 carried by the backing plate. The brake is applied by means such as a double cam 24 acting against the resistance of return springs 26 and 28.

The floating pivot 16 slidabl, engages the backing plate 12 at one end, and adjacent its end it is grooved to receive a radial fork or yoke in a stop 30 adjustably mounted on an eccentric bolt 32 and positioned angularly by engagement with an adjustable eccentric 34, both bolt 32 and cocentric 34 being carried by the backing plate.

When the brake is released, spring 28 shifts shoe 1% inwardly until pivot 16 engages the bottom of the fork or yoke in stop so. The exact iii position of stop 30 can be set by manipulating eccentrics 32 and 34. Theoretically the center line of the fork or yoke should be an are about the anchor point of shoe 18, but for the few hundredths of an inch movement that is necessary the arrangement shown is a sufilciently close approximation.

Shoe 20, as explained above, is anchored on a fixed pivot 22, being ofiset as shown in Figure 4 so that the pivot 22 need not interfere with the web of shoe 18 which extends past it. Shoe 18 has at its end a short compression link 36 connected to the web of shoe 20 by a pivot 38, and frictionally pivoted to the web of shoe 18 by means such as a nut and bolt 40 drawn up tight enough so that it yieldingly resists any relative movement of shoe 18 and its link 36, so that they normally turn as a unit. The shoe can, however, shift under load, so that it will automatically adjust itself when the brake is applied, to give full contact with the drum.

While one illustrative embodiment has been described in detail, it is not my intention to limit the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim:

1. A brake comprising, in combination, a shoe mounted on an anchor pivot at one end, and another shoe overlapping the anchored end of the first shoe and having its end linked to the first shoe, said other shoe being shiftable bodily at both ends and being anchored only through said link.

2. A brake comprising, in combination, a shoe mounted on an anchor pivot at one end, and another shoe shiftable bodily at both ends to adjust its applied position automatically and linked to the first shoe adjacent its center.

3. A brake comprising, in combination, two overlapping shoes, one of which is anchored, and which are connected adjacent the end of one shoe by a link frictionally pivoted to one of the shoes.

4. A brake comprising, in combination, two overlapping shoes, one of which is anchored, and which are connected adjacent the end of one shoe by a link frictionally pivoted to the unanchored shoe.

5. A brake comprising, in combination, an anchor, a shoe pivoted on said anchor, and a bodily-shiftable shoe extending past said anchor and linked to the first shoe.

6. A brake comprising, in combination, an anchor, a shoe pivoted on said anchor, and a bodilyshiitable shoe extending past said anchor and linked to the first shoe by a irictionaliy connected member.

7. A brake comprising, in combination, two overlapping shoes, one of which is anchored, a link connecting the two shoes and which is arranged adjacent the anchored end ot said one shoe, and means yieldingly resisting relative movement of the link and one of the shoes.

8. A brake comprising, in combination, two overlapping shoes, a link connecting the ends oi! the two shoes, means yieidingly resisting relative movement of the link and one of the shoes, and means adjacent said link for taking the torque of the shoes.

ROY S. SANFORD. 

